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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2115a523c08f62ba4e6c9adab719024ed5c4cee913f4ab33dd077771b99588' 
  AND token = 'ZdpIQx9uXJlOIDVHR+XEbiP+jGv0fNIS2Rhd28r5FC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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