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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7b53f1247d6c9abd3b36627c14987a886e287677e87df94c90b03bdd61711a' 
  AND token = 'QkW2gsYoSDn9gtLPN4F8yBJ3vEA5nY17X5ZAp47Kg7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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