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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e10335b259a9d15776044d50a3de0f1733de150aeaaa61c9facfad994fea7c' 
  AND token = 'mibjG2mfikBA8uR0Gt3wBFWgqV3KVt/mlLTpYl0uK/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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