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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75c8ecfb02aa2ad104913e5526785ac1d79318396dc01ba461fd29a5982ce1d' 
  AND token = 'nRmBDHDAYwYXVLq8PH7ubpjImnZydaDlasfXIwLeXVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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