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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f72c77c6e7a8692901df61aa2d8712e44c11e139888ee1cf24e18e2ac702b71' 
  AND token = 'sH+ZjafluPaUDlDCOswN9iujUksF3Cdi5CKegPkLZHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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