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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad03d2d98e0d98a57595f9efe8e680ba34746b0a08195fc54d0b14f7db362aa' 
  AND token = '93CSc95K0AKU6JW22dNL9+1mWdR6EzX1ht7/TpQmpGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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