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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8917da82ad9abcf019bed0ed5645d287dab114115a3f39e617442b6415e0cac5' 
  AND token = 'Ex0uvlbAOZhlZHCNTzM4HcbYHc/Z/CYiHn2Su3GF72Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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