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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0940e8adc8a14b77740e253c42be44ee7eb37ee44a75483dca6dee1a5a4f8a4' 
  AND token = 'wK9/HLZe9sm3qlRT6jSyeMl+8snApAahAAuFD5W8QCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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