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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb2d5b014b80eb305bd7af5028c4d1e63e14012773532803465823acba892a3' 
  AND token = 'Dw/+RIvtbJHFYUzmi8Ym7R0a1ibWNSseg+4ca/WQLuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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