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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b498f666842974b7b6fd6ad3babecfa51073173d886e8de814825251f0495726' 
  AND token = 'arr8Gx1NYbKhslS5EPz35sFr+8evG8ViiytDmm/h464=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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