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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd319cdb22af2fc2f6dea24194c712d946188ed632001b6b4f1af171a786f119' 
  AND token = 'XnZE+ChP4dtNnaAnsW5AB9NqUGNOqUz/pV3gS/grFss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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