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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c694ed9c9f18f25127be7d8db182734aa6b070d326ea2d5851503641aa66d3' 
  AND token = '1X/kHI/yflCIewN5aksEbeIO21gbSqaRZrz6F6KXoQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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