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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc885d3414fc25955e943b3a06c9b5b96152295e75650ea831c805a683faf8a7' 
  AND token = 'bgJsOSL5gX+t23yz+U8gyN3KfapC/xoKZmr7rLF53yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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