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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297d7ee771bd0b52b0b5701ecb2a62581c48f6c65df713dbef34b824fffd61e0' 
  AND token = '82vTGCSUOm5lZeilDLdRD4UfzHMtzVxAzBWdWfsyp10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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