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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb02c7ed3f0594bc6a3968f9aff1d95ed50b9ff8ca5629c615009a59b6dfd483' 
  AND token = '2KESE4iWMW+lYPElSKzsiscXAdnOs6vz6aQgziibl74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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