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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669ff0041f84fb1ab77fa4f320f5071ba6dd34952458e145f9eae05e7b2a0893' 
  AND token = 'cedD6Zdd77Ve9BZQw26P0LkvZtPproL3rXIZKb0BFrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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