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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594b113f54b20afaad9bb96a80c0f4b6449c5234a07e4d9ddb8f403ba084caaa' 
  AND token = 'o5L93moeYgPkpcTPylhpkLTkvZk4DrblQ1dSXUv/Bdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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