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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5a4d32b7d45179dfa60b606e316883f1afb5075a66148218d1da3dcaba1605' 
  AND token = 'Zc6q8hWEX/4qVJrKl9O2NlKJwzqyx9etOarJZncP3V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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