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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e05d494e0b82c30f5d13b67609000c6bfc9c1152f75ba19b2a6b3ae5793cb1' 
  AND token = '5KDtF81+c2twGVFBKEpSrglxfAIdpMZ32MLNciLrklg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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