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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbdf1235f1fa8e8a0847b80f0a9d842b5965d4547abe1c030bbe735b74ee60b' 
  AND token = 'UgEbUkbu3cmXfT+f473lg+un2MCsDyvdFH1HNDFgrMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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