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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86877939a5ee7b7e666e405f797212343614b3f2b54eaba2190fe241b237ea9' 
  AND token = 'gaz6olg41C3DDGUlmbi7vnXNtCBhvDlADYZR7eG5iLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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