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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f985ad78769a15c495df4ee8cec26080366e843d2941d6211fbb7cb39496a0' 
  AND token = 'lOAtZ09SPraw6XfeFemaOkFt2w6eIWa4/IfKJWb3v/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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