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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a6373670edcc28363ef58f79ee0f6e9989d67d4f575f6d7f08eb3f09417c7d' 
  AND token = 'i4npXLV3TpJuvgI2MdxjB6k4VJ3KIwBf75ZdPpMZh94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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