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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b6db243640e849c1a1fbab3cc40b83e8d8d34b811000a11c7ae163b623151e' 
  AND token = '8uBej6Ij6hcTzUdN3F7ynpjBEJ/InR/6Pbsj/ehMHGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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