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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2375beb2af820eaec6eb6739df523b562824ead26c3c4324ea0158c64b9310c' 
  AND token = 'jUeBDivdf7IUuONRz0xEbYK6IVpw9xnu/h5JD0RNiXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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