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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '521e7013dd2e9fd44cf27035c1da754372b83643455f98bf2268e7bcea208ada' 
  AND token = 'eMFUsSm5Va6SKc58uXjU2GR80wl0GVv5WZBwuG2Wodw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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