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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ceb40c04331cda609087964d6069398e2b355ab2a9d927247e02e4938c6ac63' 
  AND token = 'X9pyRe10gZzbUBnH5wBy5z/Nn2V7TasOOL8UEj6YiGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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