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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f93a0a8cd83d99742fa4f2e4c5cba85162805ac40287fd7704e85b50b571cb' 
  AND token = 'bEc5nIQWAWCsXvm/KRQbKev54gSvyomK6VlYvkykmyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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