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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ebd875ccde5b2ce8c3c4afdcd4e4e9e414a702ab1cb2e87024b5b0095cccda' 
  AND token = 'Vr2ectYYjdx9U+sbADg2wG7o/tGkes+VLO7k16BRB+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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