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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960bfb5f4176cac1c6e5c738583f063641f2204fb951d0c51c266029a9d0928c' 
  AND token = 'LbWoSeY9hyrBxQrLh3lwBI1RAX2X6xBaq+2lgOFUx+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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