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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89135a492a8d2418f148548a9dae40b9a77bffae836979ccb5e01b45717a8954' 
  AND token = 'oU6KfEaR4LuY1O+F3wZmQwPbANnaR0jTd/Afcsp8NXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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