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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb9a3d256552808ba21a33233d1d8cf5baec11f24e5d4aaf8260420df64fe8d' 
  AND token = 'ws/rpUvZ7vuCJYRWcPlrNbAPjpph8wjRO4Se/2Q0UF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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