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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef77ac74b705e18f7b5370acbe90bebfa16c357c3ccb384ec688c50ffec6887f' 
  AND token = '7x8PD/0D1l9JDdT3oJrSHNpeJUEjrPi1eWvkAazp1b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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