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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9c1b2c224d2bb55ca365721c8ac206bcff1e5cdd9914d9aad80f1f790cbe06' 
  AND token = '4yC/tpICqEwjsg9cSJy+G9u46aqxjsQPyqX/1R8ikqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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