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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee58c71844a7cfe5bf6350866ed27b684d054623a84e71c76731e6a3c69d9f8' 
  AND token = '58IXiIT2U5eOjVh0NNJRbEB2yog8VIfnVoWDYFhzud8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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