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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e430371d69a861f37bae4320cd18f3eee5588ab1b1c6bca7e7b344d669455649' 
  AND token = 'GC7GrlqDs2NgNUHnsExrvCOkZQ7wzNsvkASsGz+krjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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