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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6088ed4003de412c13d98fcfba9876912c73eeac7910f041705211c763938f14' 
  AND token = 'fkoR5AkatU11C4DBobEdGV0RIN/1VDaiZLD6+TSaRYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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