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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107a5c59b18118614864fda6cbebb47deb4a3d7533f20156de6dea1b95cdf011' 
  AND token = 'T7EfSkuMHZa7WsYdU4/fR6mBZ4UaLoLkZt0nin4AOtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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