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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44333b064d2b9ba2e94809ee6ec60c1fcf98d646914bfa2b262e319df707b6a4' 
  AND token = 'e3Ja8p1Ck3H9S7Fqw2Nbemme0YAGxZWBX3NpkrsHI/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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