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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c607b03c81269870cdf344e950bcc9f7be8adf4b7ad6ca61ade7b83edc68ad' 
  AND token = 'mW0zilLs9ekOO5jDMoXW5vIfbwDsraFOmHHmgDcMbT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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