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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640bae006d938392bc953ce9a9d555b57d45a4ead43112ce6897df548fae9dea' 
  AND token = 'S+e9l3bVTnEidF1XDirtr/EzJmPmgu6m/x19NKCUyaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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