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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c201da675de2b46b2f3fa342e6f616515ded788136481bcec55def3a6396b6' 
  AND token = '9GqZ5y10kVP/g2CgAtg4p7tu7P+5Knnf360cU+mfeAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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