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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08f05042058f3596f26299c7356fd09312080aa2c4d1a58a46da456ce55fe46' 
  AND token = 'R7HscJaADmlhUSW92L1Z9s47PmZ2iEFIYi3Y6U5Il7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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