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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa4cb8dcca9433cd4dd41030579b9f8f0b4bccb6a012e07afc6bd084231d697' 
  AND token = 'jGiuO9dWfFONnx1ma4Vonmal8gLCrHShDtYXpJaoDzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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