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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ba32e2b9faadec635b54b6044e7172677bd9685ad360c275ea45c245afe55e' 
  AND token = 'I2L64bZf5wqYWWPbAIG5rM26np9y9QkLSfRKc2YgJw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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