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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e6317acaf2ea0515cb78d949099d09ac9b3dd23a4713cd55a4dd2f6ca6098d' 
  AND token = 'pDqxwHsvjBNHLSfNIXro7CjC4m78454SQkGqoC7gGwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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