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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4e61a66d5f11ed16b180d43e0075c165b8e203a2c0c86a0be9345dea86192c' 
  AND token = 'qLS+52Y5OfqqFe79Ey2BZuXObF9pK38BXliVmpoYyFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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