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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c399272427f3b367b4df9544342ccab5d10cb0b76409031eab7c68b0315a34' 
  AND token = 'wFkPc3GiO/R/rF6GcbhVSb6Vl/KbPhWm5DQyKhB1g/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}