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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5309f14e047c8b9e00a90f625a2ca7871a985f405b33cc56f797c4d172b04719' 
  AND token = 'puCht6aFKSpCEaNuuApG9twKek1/V6zWjc5CzQV8i7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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