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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad40ddd4952980a67df2b2b6245df7398fa0129ae49e6113304fda9d8e48011e' 
  AND token = 'aljLKI6oBOveUaOKBxT1MrEEsfgSUyR7nXylAqpARbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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