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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa7c4fcf979d9d58081aa03adae7407e6d0ce4fed728f01a9dc7253b0c6943a' 
  AND token = 'YqInzdcBue0P9HkTuYVsx6sB5xOJoN/3c6aHhXxI8ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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