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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd092292421028d1facf5f08b211a0ac8e7b6a434a158f6a696e0a1d4261499ee' 
  AND token = '9Oi6I5fGBkPlrQJ7yaeuCTOiEQkayNQJdNAcpqoq1cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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