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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd762a80da2a7774fa872fa3b4ababda8f7dfe12ad1df0a986ab888f373d898b8' 
  AND token = 'qDjM0DBks5Ar3FugAuaP7H0efTIWfl5sVkzACU51RGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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