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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27131814e976fd415e5898c2a4f72d07f519bf4ba24f9d9f2a90a4a9c6897066' 
  AND token = 'xUcxYr54DeI4oQVGZiRonRkK8/brvZ44sav1n/+tpt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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