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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0e5db55daba0ca2831b1ba7d288b8cf65270361e7ce9eb5afe89c8509b74a9' 
  AND token = '9ys8y880piwMDiioC830u0Lsfn6oq1E/lIIk7Y/sa2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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